Mechanical contrivance for computing time



(ModeL) 5 Sheets-Sheet 1. J. MAGLAGAN.

MECHANICAL GONTRIVANGE FOR COMPUTING TIME.

No. 262,679. Patented Aug. 15, 1882.

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MEGHANIGAL GONTRIVANGB FOR COMPUTING TIME.

No. 262,679. Patented Aug.15, 1882.

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(Model.) 5 Sheets-Sheet 3.

J. MAGLAGAN.

MECHANICAL OONTRIVANOE FOR COMPUTING TIME.

No. 262,679. Patented Aug. 15, 1882-.

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(ModeL) MAGLAGAN 5 Sheets-Sheet 4.

MECHANICAL GONTRIVANUE FOR COMPUTING TIME.

No. 262,679. Patented Aug. 15, 1882.

MECHANICAL OONTRIVANGB FOR COMPUTING TIME.

No. 262,679. Patented Aug. 15, 1882.

Jim. 2232 1am 6 ATTORNEY.

WITNESSES wild 9m UNITED STATES PATENT OFFICE.

JAMES MAOLAGAN, OF TORONTO, ONTARIO, CANADA.

MECHANICAL CONTRIVANCE FOR COMPUTlNG TIME.

SPECIFICATION forming part of Letters Patent No. 262,679, dated August15, 1882.

Application filed October 20, 1881. (Model) To all whom it may concern:

Be it known that 1, JAMES MAGLAGAN, of the city of Toronto, in thecounty of York, Province of Ontario, Dominion of Canada, have invented anew and useful mechanical contrivanee for rapidly ascertaining theaggregate number ofdays from any one to any other specified date withinany twelve calendar months, which is fully set forth in the followingspecification and accompanying drawings, in which- Figures 1, 2, 3, and4 represent respectively top views or plans of the four quarter-sectionsof my device; Fig. 5, a cross-section through any one of the Figs. 1,2,and 3; Fig. 6, a top view or plan of the complete device.

Take a piece of mill-board or other suitable material about twelveandone-half (123 inches square, and from the center-describe threecircles in ink, having diameters of about nine, (9,)nine and one-half,(9%,) and eleven and onehalf (11.)) inches, respectively, (as being themost convenient for the purpose.) Working from the same center, by meansof a dividingengine, divide the interval between the middle and outercircles with ruled lines radiating from the center, (but commencing fromthe middle circle,) into three hundred and sixtyfive (365) equal spaces.Then by means of a rotary knife, working from said center, divide thematerial midway, or thereabout, between the middle and outer circles,which (dispensing with a fixed center to turn upon) admits of the innerdisk, 0, revolving easily, held to its place by the outer edge of thecut. Then number the spaces on the outside of the cut from one (1) tothree hundred and sixty-five, (365,) and number the spacesinside of theout according to the number of days represented by the several months ofthe yearin rotation viz., l to 3L for January, 1 to 28 for February, andso on-the names of theIrespective months being shown in the spacebetween the inner and middle circles, and divided one from the other bythe continuation of the space-line which follows the last day of eachmonth tothe inner circle. Place a pane of glass, B, of the fulldimensions of the mill-board, or other material-viz., twelve and a halfinchesover its face, having a circular piece about eight (8) inches indiameter taken from the center in order to admit of turning appliancesbeing attached-say, three small knobs, a, placedin triangular positionabout three (3) inches from the center. The object of the glass is notonly to protect the surface of the contrivance, but to hold the movabledisk in plaeei. 0., to keep it down. Place the whole in a frame, A, theouter portion of the face being slightly raised by means of a thin layerof paper or other material placed between it and the back board, freeingthe movable disk from thcpressare of the glass. A square piece of glazedlinen covers the surface of the back board to facilitate the turning ofthe inner disk.

To find the number of days from any one date to any other within anytwelve months, place each hand upon a knob and turn the first day whichis to be included opposite to the arrow at 1, and opposite the last daywhich is to be included will be found the total number of days required.

I claim as my invention- The combination, with the frame A, of thstationary disk and revolving disk arranged with the stationary disk,both disks having numerals thereon, as described, and a pane of glassarranged over said disks, having a circular central opening, I), andturning appliances or knobs a projecting through said opening andconnected to revolving disk, substantially as and for the purpose hereinshown and described.

JAMES MACLAGAN.

Witnesses:

FREDERICK Tnos. J ONES, Fnnwcrs A. OANELL.

